The
World Painter tool is an awesome tool. It's pretty much like SC4Terraformer for Minecraft! I use it a lot, and the results are very satisfactory in my opinion. My first map, the Isle of Lothair, is almost ready for release. Here's an overhead view of the map:

I still need to work on more of the biome spread, and populate the underground with ores and such. But otherwise, it is pretty much finished! Tell me what you think!